Preparation and electrochemical characterization of a new NiMoO4 catalyst for electrochemical O-2 evolution

作者：Singh R N^*; Awasthi Madhu R; Sinha A S K

来源：Journal of Solid State Electrochemistry, 2009, 13(10): 1613-1619.

DOI：10.1007/s10008-008-0744-7

• Oxygen evolution
• Electrocatalytic properties
• Electrocatalysis
• Mixed oxide

The NiMoO4 catalyst has been obtained by a precipitation method under a controlled pH condition and characterized ex situ by infrared, X-ray diffraction, Brunauer-Emmett-Teller (BET), and particle size, and in situ by cyclic voltammetry, impedance and steady-state anodic Tafel polarization techniques. Results show that NiMoO4 has pure crystalline monoclinic phase with the crystallite size similar to 50 nm and the lattice constants, a = 9.597 angstrom, b = 8.765 angstrom, c = 7.667 angstrom, and beta = 114.22 degrees. Values of the average particle size and BET surface area of the oxide powders are found to be 730 nm and 11.75 m(2)/g, respectively. The oxygen evolution reaction follows the first-order kinetics with respect to OH- concentration, the Tafel slope being similar to 70 mV.

• 出版日期2009-10